Hi Maria,
I can see you are trying!
What you need to do is remove the file writing operations from your data collection loop.
The simplest solution would move the data formatting and file write operations to after your data collection loop. That way the file I/O nad formatting will not get in the way of your data acquisition operations.
There are limitations in this simple approach i.e. you need to buffer all of your data in memory until it is time to write the data to file.
If you need to log while collecting, then you may want to use a queue to pass the un-fromatted raw data to a parallel loop that saves the raw, un-formatted data to disk. Latter on you can read the raw data and fromat the interesting parts.
To help you better, please let us know
how much data you want to save, how often etc.
I have done what you are attemting for over a hundred channels but I did not even entertain the possiblity of converting the data to text until after all of the hard work was done and the computer was just sitting around board.
Please post an image of your code with your questions and let know more about what you are trying to do.
Ben
